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Programs which process diverse types of transactions need to obtain transaction specifications, and determine the type of each transaction before calling the routine for that type of transaction.
English (United States)
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Handling Diverse Transaction Types in Random Sequence
Programs which process diverse types of transactions need to obtain
transaction specifications, and determine the type of each transaction before
calling the routine for that type of transaction.
There are many ways of identifying the transaction type, for example: 1.
Inspecting flags and/or values in control information. 2. Recognizing special data
values. 3. Knowing the relative positions of different classes of data in the input
area. 4. Having separate input areas for each type of transaction.
Some drawbacks associated with different methods of determining the type
of processing required are listed below: A. The overhead associated with
obtaining specifications and identifying and scheduling the correct routine may be
prohibitively high. B. Control information may be a significant portion of the data. C. The number of transactions per invocation may be limited (e.g., by small
count fields). D. The number of different types of transactions may be restricted
(e.g., by small flag fields). E. It may be necessary to process transactions in a
specific sequence. F. It may be necessary to obtain all the transaction
specifications before any processing can begin. G. It may be difficult to extend a
method to process additional types of transaction. H. Most methods lack the
generality to be applied to widely varying types of transaction.
The method described hereinan avoinads the drawbacks listed above.
Transaction descriptors consisting of 2, 3 or 4 bits each are blocked into
words (32 bits each). The numeric value of each descriptor defines a register
holding the address of the routine to proces...